50
7.2.2 How to clean sample cell (block cell)
(1) Turn off the power switch, stop the flow of
sample gas and flow zero gas for a few
minutes.
Loosen the knurled knobs on the front
panel and pull out the analyzer interior by
means of the grips.
(2) Loosen the cap nuts fixing the gas inlet
pipe and remove the internal gas inlet pipe.
(3) Remove two detector
Note: Be careful since the distribution and
block cells are fixed together with
the detector.
(4) Using the furnished cell assembly tool, turn
the retaining ring leftward and detach it
from the cell.
Refer to Fig. 7-2.
(5) For cleaning the infrared-ray transmitting window and cell interior, first remove heavy con-
tamination with a soft brush or the like, then wipe lightly with a soft cloth.
Be especially careful when cleaning the window since it is easily scratched.
(6) When cleaning of the sample cell is finished, then reassemble the cell in its original position.
If the zero point has deviated considerably when operating again, select a low range and carry
out optical zero adjustment (refer to item 7.2.3).
Also, the drift integrated value should be cleared (see Item 6.
⑤
).
If the infrared-ray transmitting window is only lightly contaminated, it can be cleaned by
wiping lightly with the soft cloth to which chrome oxide powder is added. But if heavily
contaminated, then the window must be replaced.
Be careful not to apply unreasonable force when cleaning.
Knurled
knob
Power switch
Knurled knob
Retaining ring
O ring retainer
Outer O ring
Inner O ring
Infrared-ray
transmitting window
Cap nut fixing gas inlet pipe
Detector fixing screws
CAUTIONS
